If x + y = 10 and xy = 16, find the value of x2 -xy+y2
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x+y=10,xy=16
x²-xy+y²
=x²+y²-xy
=x²+y²-xy+2xy-2xy
=x²+y²+2xy-xy-2xy
=(x+y)²-xy
=10-16
= -4
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